Ignition-dynamo.



I. G. ZIIVIIVIERIVIAN.

IGNITION DYNAIvIo.

APPLICATION FILED MAY'I2. |916.v

1,298,624. Patemeea Mar. 25,1919.

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40 are brought out to separate terminals, thereaccompanying drawing.

" ,N Umirnn srarns rATENT carica.

JAMES GARFIELD ZIMMERMAN, 0F SUMTER, SOUTH CAROLINA, ASSIGNOR T0 SPLITBORF ELECTRICAL COMPANY, OF NEWARK,.NEW'JERSEY, A. CORPORA- TION 0F NEW JERSEY.

IGNITION-Dynamo.-

vand State of South Carolina, have invented certain new and useful Improvements. in Ignition-Dynam'os, of which the following 1s a specification, reference being had to the IMy invention relates to ignition dynamos commonly known as magnetos, and comprises an improved arrangement yof the citrcuits and parts, whereby the magneto will as are also all movin 'brush connections during the operation of produce two simultaneous sparks, and may be used on a two cylinder engine having cylinders 180 degrees apart. The spark in the cylinders of such engines may occur simultaneously, 'for when the piston in one cylinder is in the iiring stroke, the other piston is on the exhaust stroke. By my invention the usual distributer is eliminated, contacts or sliding the machine.

A further object is to provide a compact separate from the windings and requiring Wiresor members forming connections, I combine the spark` gap as an element directl with' said windings, thus enabling the wind5I ings vto be removed without disconnecting 'the spark gap, thereby enabling the wind ings to be tested with the Spark gap adjust- `ment as actually used in service on the :magn

eto. I also show and describe an improved arrangement for a magneto of this type in whichy all of the ends of the coil windings bv eliminating the resistance of the joints in tlie framework of the machine, which resistance is' present when the lframe is employed to `conduct the current from one of the windin sto an other Jart such as the condenser g Y Y a.

' or interrupter contacts.

Inthe accompanyingdrawing, Figure 1, is an end View of a magneto, partly `1`n secspeeiaeation ofi Letters Patent.

Patented Mar. 25, 1919.

tion, showing the side of the generating coil and the two high tension terminals connected therewith. Fig. 2, a diagram showing the connections of the coil and the improved arrangement of the terminals. Figs. 3 and 11 show in detail the high tension terminal and the insulating. plate riveted thereto, this windings, the primary designated by the;

numeral 1, and the secondary by the numeral 2. The core 3 supports the insulating heads 5 and 6, and upon one of these is mounted the primary terminals, 7 and 8 and one of the high tension or secondary terminals 9. The remaining high tension terminal 10 is mounted on the opposite head. These high tension terminals have pointed portions indicated at 11 and 12 between which is formed a safety spark gap 13 for limiting the potential in the secondary winding. To insure the proper spacing of the l gap 13, and to provide a unit arrangement that is readily secured to the coil, I provide an insulating plate of mica `or the like, shown at 111-., to which the high tension terminals are riveted. The result is a complete unitary terminal structure forming a safety spark gap, all as shown at Fig. 3, the ends l5 and 16 of the terminals forming contact surfaces for the brushes 17 and 18 of the high tension terminals 19 and 20, carrying the cables 21 and 22 leading to .the sparkplugs indicated at QBNand 24. The'ends 15 and 16 of theunitary spark gap member have portions turned'downwardly as shown in Figs.l 1 and 4, so as to embrace the'insulating heads 5 and `6 of the coil thereby preventing endwise mov'ement of the said unitary structure.

he primary terminals connect to a suitable condenser 25 and to the usual interrupterfinechanism, indicated in the diagram' The secondary terminals 19 and 20 are lmounted' upon the side or cover plates .27 'and 28 of the magneto, which togetherwith the magnet casing 29 serve to completely surround and inclose the coil.

As'the operation of a magneto of this description is already well known I. will not describe ,the same, except to state when the secondar winding is energized, simultaneous spar rs will be produced at the plugs 23 and 24. In case of trouble in the plugs or an open circuit in one of the cables connected thereto, the safety spark gap 13 will become operative, thereby limiting the potential and saving the secondary winding from breakdown.

It will be seen thatthe coil is readily removed from the magneto as a unit, by tak-lv ing ofi the side plates and lifting the coil out of place, and that this can be accomplished without disassembling the safety spark gap or secondary terminals, which are attached to the coil proper in any suitable manner such as by the layer of tape indicated at 4. When the coil is removed, by connecting a suitable source of energy tothe primary terminals thereof, the coil maybe tested with .the safety spark gap 13 in operative connection therewith, and with assurance that all of the terminal connections are as actually in use in the magneto.

f Having thus described my' invention I claim:

`1. In an ignition dynamo, a coil having a primary and a secondary winding, heads on said coil, terminals' on said heads for the secondary winding forming a safety spark gap, and means for connecting conductors to said terminals.

2. In an'ignition dynamo, a coil comprising a core having primary and secondary windings thereon, heads 0n said core, terminals on said heads connected to the ends of said secondary winding and 'forming a safety spark gap across said coil, and cableconnecting means in contact with each o1' said terminals.

3. In an ignition dynamo, a generating winding having heads, terminals for said windings on said heads, cover plates adjacent the ends of said winding, and terminals Acarried by said plates and in contact with.

the terminal ends of said windings.

4. Iii an ignition dynamo, a generating winding having insulating heads, terminals i 'l for said winding carried on said heads,

cover plates adjacent the heads of said wind- I ing, and terminals carried by said cover plates and in contact with the winding terminals.

'5. In an ignition dynamo, a generating winding, heads on said winding, terminals for said winding carried on said heads,

l scribed. l

6. In an ignition dynamo, a fixed generating winding, terminals for the ends of lsaid winding forming a safety spark gap across the winding, a pair of cover plates adjacent "the ends of said winding and serving together with ,other parts to inclose the windin and terminals on said cover, plates msu ated therefrom and passing therethrough and in contact with said winding terminals, substantially as described. 7 'In an ignition dynamo, a coil comprising a core having primary and secondary windingsthercon, heads on said core, an insulating member overlying the windings between the heads, terminals riveted to said insulating member and forming across the top thereof a safety spark gap, means for securing said terminals to said windings, and means on said terminals engaging said heads and forming thereon surfaces adapted to be engaged by circuit-conducting means,

vthe foregoing parts, and means carried on said casing projecting therethrough and engaging said surfaces whereby current may be conducted outside the Inagneto,vsubstan tially as described.

9. In an ignition` dynamo, a unit coil structure comprisinga core, heads thereon a primary and secondary winding inclosed between said heads, aplate of insulating material overlying the windings between said heads, terminals for the secondary winding secured tosaid plate and forming across 'the top thereofa safety spark gap,

downwardly extendin 'portions on lsaid ter-A minahadapted to ein race said heads and prevent endwise movement of said terminals on the coil, and upturned portions on said terminals forming contact surfaces, substantially as described.

lOll

l0. In an ignition dynamo, covellI plates,

a unit coil structure, a primary wmding thereon, a secondary'zvindng about said primary Windin and velectrically vseparate 5 therefrom, an a pair of detachable cable terminals on said plates in Contact with said secondary Winding, whereby both ends of said winding may be connected to vranslaibN ing devices for the production of simultanea ous sparks thereat.

In testimony 4whereof I hereunto aix my signature.

JAMES GARFIELD ZIMMERMAN. 

